Memory and Database

Friday, November 17, 2006

Types of Computer Memory

Computer memory- physical and virtual memory

Physical memory refers to the actual chips capable of holding data.

Types of memory
:
RAM: (random access memory): It is possible to read and write into RAM, in comparison to ROM, which is only able to be read the data. RAM requires a steady flow of electricity to maintain its contents, which means as soon as the power is taken away whatever was stored in the RAM is lost.

ROM: (read-only memory): Computers contain a small amount of read only memory necessary to instruct the computer to start.

PROM: (programmable read-only memory): Memory chip on which a program can be stored. Only able to be used once.

EPROM
: (erasable programmable read-only memory): A special type of PROM that has the ability to be erased by exposing it to ultraviolet light.

EEPROM: (electrically erasable programmable read-only memory): Also a special type of PROM, with the ability to be erased when exposed to an electrical charge.

http://www.webopedia.com/TERM/M/memory.html


Computers also use virtual memory.

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